CN107809216A - A kind of pressure-sensitive compensation circuit of OCXO and OCXO frequency pressure-sensitive character ameliorative ways - Google Patents
A kind of pressure-sensitive compensation circuit of OCXO and OCXO frequency pressure-sensitive character ameliorative ways Download PDFInfo
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- CN107809216A CN107809216A CN201711181963.6A CN201711181963A CN107809216A CN 107809216 A CN107809216 A CN 107809216A CN 201711181963 A CN201711181963 A CN 201711181963A CN 107809216 A CN107809216 A CN 107809216A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/02—Details
- H03B5/04—Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
Abstract
A kind of pressure-sensitive compensation circuit of OCXO and OCXO frequency pressure-sensitive character ameliorative ways, method and step (1) tests the pressure-sensitive character of OCXO products by vacuum test, the frequency values under different air pressure are recorded, calculate the peak frequency changing value Δ f under normal pressure and vacuummax, calculate normalized frequency changing value dy；(2) experimental test in step (1), when vacuum frequency is less than normal pressure frequency, capacitive or resistive compensation circuit are built；Otherwise, resistive compensation circuit is built；(3) according to normalized frequency changing value dy is calculated in step (1), with reference to the form of the specific compensation circuit built in step (2), electric capacity C in OCXO product oscillating circuits is calculatedt11Or electric capacity Ct21Equivalent control capacitance；(4) according to the equivalent control capacitance calculated in step (3), to the corresponding electric capacity C in the compensation circuit of structure in step (2)t11Or electric capacity Ct21Handled, it is corresponding equivalent control capacitance to make its capacitance.
Description
Technical field
The invention belongs to OCXO (high stable crystal oscillator) technical field, more particularly to a kind of OCXO products become in pressure
Changing improves the method for output frequency pressure-sensitive character in environment.This method in OCXO circuits by adding compensation circuit, the circuit
In OCXO Product environment pressure changes, pressure information is obtained by pressure sensor and is converted into electrical parameter, control circuit
Load capacitance adjustment is carried out according to the characteristic of product, reaches the purpose of compensation frequency change.
Background technology
Output frequency can change OCXO products as ambient pressure environment changes in use, mainly due to crystal
Itself it is pressure-sensitive component, the skew of output frequency can occur in this process of environmental change is undergone for OCXO products, skew
Measure as ± 1E-8~1E-7.The OCXO of aerospace applications output frequency degree of accuracy index request is typically in ± 5E-8~1E-7 amounts
Level, therefore frequency accuracy index meets to require system when appearing in normal pressure when applying, and index is overproof under vacuum conditions
Or loss of lock.
At present, do not processed substantially with the change of pressure for OCXO frequencies, not disclosed report, typically by OCXO
Change is reserved when normal pressure is debugged by normal pressure and the variable quantity of vacuum test test frequency in advance when changing applied to pressure environment
Change surplus to solve, systematic parameter is changed in system integration test, it is relatively complicated.
The content of the invention
The technology of the present invention solves problem：Overcome the deficiencies in the prior art, there is provided the pressure-sensitive compensation circuits of OCXO and
OCXO frequency pressure-sensitive character ameliorative ways.
The solution of the present invention one：A kind of pressure-sensitive compensation circuits of OCXO, increase an appearance outside OCXO product oscillating circuits
Property pressure sensor；Described OCXO product oscillating circuits equivalents are resistance Rq, inductance Lq, electric capacity CqThree series connection after with
Electric capacity C0Parallel connection, the both ends series inductance L after parallel connectiont1, electric capacity Ct11, form oscillation circuit；Capacitive pressure sensor is connected in parallel on electricity
Hold Ct11Both ends.
The solution of the present invention two：A kind of pressure-sensitive compensation circuits of OCXO, increase a resistance outside OCXO product oscillating circuits
Property pressure sensor and varactor Ct21；Described OCXO product oscillating circuits equivalents are resistance Rq, inductance Lq, electric capacity
CqThree series connection after with electric capacity C0Parallel connection, the both ends series inductance L after parallel connectiont1, electric capacity Ct21, form oscillation circuit；Resistive pressure
The output access oscillation circuit of sensor, varactor Ct21It is connected in parallel on electric capacity Ct22Both ends.
Further, in addition to operational amplifier, the output of resistive pressure sensor are followed by by operational amplifier amplification
Enter oscillation circuit.
A kind of OCXO frequencies pressure-sensitive character ameliorative way, step are as follows：
(1) pressure-sensitive character of OCXO products is tested by vacuum test, records the frequency values under different air pressure, is calculated often
Peak frequency changing value Δ f under pressure and vacuummax, calculate normalized frequency changing value dy；
(2) experimental test in step (1), when vacuum frequency is less than normal pressure frequency, build claim 1 or
The compensation circuit of claim 2；Otherwise, the compensation circuit of claim 2 is built；
(3) according to normalized frequency changing value dy is calculated in step (1), with reference to the specific compensation built in step (2)
The form of circuit, calculate electric capacity C in OCXO product oscillating circuitst11Or electric capacity Ct21Equivalent control capacitance；
(4) according to the equivalent control capacitance calculated in step (3), to pair in the compensation circuit of structure in step (2)
The electric capacity C answeredt11Or electric capacity Ct21Handled, it is corresponding equivalent control capacitance to make its capacitance.
Further, when structure be the compensation circuit described in scheme one when, equivalent control capacitancePass through following public affairs
Formula calculates：
Wherein, using Cq、Ct12Crystal equivalent capacity C in compensation circuit is represented respectivelyq, capacitive pressure sensor electric capacity
Value；Δ C is the output characteristics of capacitive pressure sensor.
Further, when structure be the compensation circuit described in scheme two when, equivalent control capacitancePass through following public affairs
Formula calculates：
Wherein, using Cq、Ct21Crystal equivalent capacity C in compensation circuit is represented respectivelyq, varactor capacitance Ct21；
VtFor the output voltage of resistive pressure sensor, φ=0.7V, n are varactor capacitance variability indexs, and α sensors pressure sensitivity is clever
Sensitivity, Δ P change value of pressure.
Further, when structure be comprising operational amplifier compensation circuit when, equivalent control capacitanceUnder
State formula calculating：
Wherein, using Cq、Ct21Crystal equivalent capacity C in compensation circuit is represented respectivelyq, varactor capacitance Ct21；
VtFor the output voltage of resistive pressure sensor, φ=0.7V, n are varactor capacitance variability indexs, and α sensors pressure sensitivity is clever
Sensitivity, Δ P change value of pressure, the scale factor of k operational amplifiers.
Further, normal-pressure vacuum experiment is re-started to the OCXO products after step (4) processing, to verify OCXO frequencies
Pressure-sensitive character improvement.
Further, when needing to improve OCXO products in the output frequency degree of accuracy during whole pressure change, to becoming
Hold diode Ct21Or capacitive pressure sensor carries out linearization process, obtains new varactor Ct21Or capacitive pressure
The capacitance of sensor, re-execute step (3), (4).
The present invention has the beneficial effect that compared with prior art：
(1) present invention solves the OCXO products side that frequency accuracy changes caused by ambient pressure environment changes
Method, this method are based on pressure sensor and pressure change are converted into electrical parameter change, by control circuit compensation adjustment, make OCXO
The output frequency degree of accuracy keeps stable, improves the performance and environmental suitability of product.
(2) compensation method of the present invention is less using analog circuit device, and reliability is high.This programme employs ratio fortune simultaneously
Electric discharge road, improves the compensation ability of circuit and expands the range of choice of pressure-sensitive compensating device, reduce circuit cost.
(3) present invention improves OCXO product pressure-sensitive character indexs and uniformity, improves yield rate, effectively reduces and is
To the tolerance requirements of OCXO frequency accuracies during system application, system reliability is improved.
(4) complete the switching of bidirectional compensating using operational amplifier and amplification drives, improve system balance ability, together
When extend the range of choice of pressure-sensitive device.
Brief description of the drawings
Fig. 1 is pressure compensation circuit theory diagrams of the present invention；
Fig. 2 is capacitive pressure compensation circuit diagram of the present invention；
Fig. 3 is the resistive pressure compensation circuit diagram of the present invention.
Embodiment
As OCXO is used to produce stable reference signal, in order to ensure the stationarity of output of products frequency accuracy and product
In ground joint-trial and the uniformity in vacuum environment use, the mode for employing circuit compensation carries out frequency compensation.Compensation electricity
Road obtains pressure information by pressure sensor and is converted into electrical parameter, control circuit root when OCXO product pressures change
Load capacitance adjustment is carried out according to the characteristic of product, reaches the purpose of compensation frequency change.
As shown in figure 1, the pressure-sensitive compensation circuits of OCXO mainly include the vibration of pressure sensor, control network and object OCXO
Circuit；When pressure sensor can use capacitive pressure sensor to use resistive pressure sensor, when for resistive pressure
Need to increase operational amplifier during sensor, in compensation circuit.
Pressure sensor mainly completes conversion of the air pressure change to electrical characteristic parameter, and operational amplification circuit passes resistive pressure
The voltage of sensor output carries out operation amplifier, with satisfaction control network to voltage requirements；Control network function is to realize difference
The change of equivalent load capacitance under magnitude of voltage, to complete the adjustment of OCXO output frequencies compensation.
Fig. 2 is the schematic diagram of the pressure-sensitive compensation circuit of capacitive of the present invention, and the compensation circuit is outside OCXO product oscillating circuits
Increase a capacitive pressure sensor；Described OCXO product oscillating circuits equivalents are resistance Rq, inductance Lq, electric capacity CqThree
Person series connection after with electric capacity C0Parallel connection, the both ends series inductance L after parallel connectiont1, electric capacity Ct11, form oscillation circuit；Capacitive pressure sensing
Device Ct12It is connected in parallel on electric capacity Ct11Both ends.Because capacitive pressure sensor is monotonically changed with air pressure, (capacitance reduces and subtracted with pressure
It is small), therefore this method is only suitable for the situation that product frequency diminishes compared with normal pressure lower frequency under vacuo.
Such as 3 be the schematic diagram of the resistive pressure-sensitive compensation circuit of the present invention, and the compensation circuit is outside OCXO product oscillating circuits
Increase resistive pressure sensor and varactor a Ct21；Described OCXO product oscillating circuits equivalents are resistance Rq、
Inductance Lq, electric capacity CqThree series connection after with electric capacity C0Parallel connection, the both ends series inductance L after parallel connectiont1, electric capacity Ct22, form and vibrate back
Road；The output access oscillation circuit of resistive pressure sensor, varactor Ct21It is connected in parallel on electric capacity Ct22Both ends.The program can lead to
Cross operational amplifier and realize that the frequency under all operating modes (frequency enters vacuum by normal pressure and becomes greatly or diminish) changes.When selected resistance
Property voltage sensitive sensor output voltage it is smaller when (such as mV magnitudes), output voltage can be improved to (V magnitudes) with discharge circuit, improved
The alternative of circuit compensation ability and device.
The simply a kind of simplest implementation provided in Fig. 2,3, under the implementation, the electric capacity C in Fig. 2t11It is right
Network should be controlled, the C in Fig. 3t21And Ct22Corresponding control network, k correspond to operational amplification circuit.
A kind of OCXO frequencies pressure-sensitive character ameliorative way, step are as follows：
(1) pressure-sensitive character of OCXO products is tested by vacuum test, records the frequency values under different air pressure, each air pressure
Kept for 30 minutes, calculate the peak frequency changing value Δ f under normal pressure and vacuummax, calculate normalized frequency changing value dy；
(2) experimental test in step (1), when vacuum frequency is less than normal pressure frequency, build shown in Fig. 2 or Fig. 3
Compensation circuit；Otherwise, the compensation circuit shown in Fig. 3 is built；
(3) according to normalized frequency changing value dy is calculated in step (1), with reference to the specific compensation built in step (2)
The form of circuit, calculate electric capacity C in OCXO product oscillating circuitst11Or electric capacity Ct21Equivalent control capacitance；
Situation 1：OCXO vacuum frequencies are small compared with normal pressure
A) capacitive pressure sensitivity compensation circuit (Fig. 2), wherein R are selectedq、Lq、Cq、C0And Lt1It is true for OCXO products oscillating circuit
Determine parameter, Ct12For capacitive voltage sensitive sensor capacitance, equivalent control electric capacity can be calculated by formula (1)Value.
Wherein.Using Cq、Ct12Electric capacity C in compensation circuit is represented respectivelyq, capacitive pressure sensor capacitance；Capacitive pressure
Force snesor output characteristics is Δ C=S Δ P, and wherein S represents sensitivity, and △ P represent change value of pressure..
B) resistive pressure sensitivity compensation circuit (Fig. 3) is selected.Wherein Rq、Lq、Cq、C0And Lt1It is true for OCXO products oscillating circuit
Determine parameter, V after resistive pressure sensitivity device is selectedtIt can determine that, C is can determine that after selecting varactort21.It can be calculated by formula (2)
Equivalent control electric capacity Ct22Value.
Wherein, using Cq、Ct21Electric capacity C in compensation circuit is represented respectivelyq, varactor Ct21And capacitance；VtFor resistance
The output voltage V of property pressure sensort=α P+ β, wherein φ=0.7V, n are varactor capacitance variability indexs, α sensors
Pressure sensitivity sensitivity, Δ P change value of pressure, k discharge circuit scale factors.
(4) according to the equivalent control capacitance calculated in step (3), to pair in the compensation circuit of structure in step (2)
The electric capacity C answeredt11Or electric capacity Ct21Handled, it is corresponding equivalent control capacitance to make its capacitance.Change original product pair
Answer position electric capacity Ct11Or electric capacity Ct21Capacitance parameter.Specific processing can be in former electric capacity Ct11Or electric capacity Ct21Outside again simultaneously
Join an electric capacity to change capacitance, or replace the electric capacity for being equal to equivalent control capacitance again.
(5) OCXO after compensating will be completed and re-starts normal-pressure vacuum experiment, verify the effect of compensation.If for OCXO
Product output frequency accuracy requirement during whole pressure change is higher, can be by by varactor Ct21By some electricity
Hold and varactor series-parallel network replaces (carrying out linearization process), can obtain during whole pressure change preferably
Compensation effect.Equally similar mode can also be used to carry out linearization process the capacitive pressure sensor in Fig. 2.Obtain new
Varactor Ct21Or the capacitance of capacitive pressure sensor, step (3), (4) are re-executed, until referring to needed for meeting
Mark requires.
Unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
Claims (9)
- A kind of 1. pressure-sensitive compensation circuits of OCXO, it is characterised in that：Increase a capacitive pressure outside OCXO product oscillating circuits Sensor；Described OCXO product oscillating circuits equivalents are resistance Rq, inductance Lq, electric capacity CqThree series connection after with electric capacity C0 Parallel connection, the both ends series inductance L after parallel connectiont1, electric capacity Ct11, form oscillation circuit；Capacitive pressure sensor is connected in parallel on electric capacity Ct11 Both ends.
- A kind of 2. pressure-sensitive compensation circuits of OCXO, it is characterised in that：Increase a resistive pressure outside OCXO product oscillating circuits Sensor and varactor Ct21；Described OCXO product oscillating circuits equivalents are resistance Rq, inductance Lq, electric capacity CqThree After series connection with electric capacity C0Parallel connection, the both ends series inductance L after parallel connectiont1, electric capacity Ct21, form oscillation circuit；Resistive pressure sensor Output access oscillation circuit, varactor Ct21It is connected in parallel on electric capacity Ct22Both ends.
- 3. circuit according to claim 2, it is characterised in that：Also include operational amplifier, resistive pressure sensor it is defeated Go out and access oscillation circuit after operational amplifier amplifies.
- 4. a kind of OCXO frequencies pressure-sensitive character ameliorative way, it is characterised in that step is as follows：(1) by vacuum test test OCXO products pressure-sensitive character, record the frequency values under different air pressure, calculate normal pressure and Peak frequency changing value Δ f under vacuummax, calculate normalized frequency changing value dy；(2) experimental test in step (1), when vacuum frequency is less than normal pressure frequency, claim 1 or right are built It is required that 2 compensation circuit；Otherwise, the compensation circuit of claim 2 is built；(3) according to normalized frequency changing value dy is calculated in step (1), with reference to the specific compensation circuit built in step (2) Form, calculate OCXO product oscillating circuits in electric capacity Ct11Or electric capacity Ct21Equivalent control capacitance；(4) according to the equivalent control capacitance calculated in step (3), to corresponding in the compensation circuit of structure in step (2) Electric capacity Ct11Or electric capacity Ct21Handled, it is corresponding equivalent control capacitance to make its capacitance.
- 5. according to the method for claim 4, it is characterised in that：When structure be the compensation circuit described in claim 1 when, Equivalent control capacitanceCalculated by following formula：<mrow> <mi>d</mi> <mi>y</mi> <mo>=</mo> <mo>-</mo> <mfrac> <msub> <mi>C</mi> <mi>q</mi> </msub> <mn>2</mn> </mfrac> <mo>&CenterDot;</mo> <mfrac> <mrow> <mi>&Delta;</mi> <mi>C</mi> </mrow> <msup> <mrow> <mo>(</mo> <msub> <mover> <mi>C</mi> <mo>^</mo> </mover> <mrow> <mi>t</mi> <mn>11</mn> </mrow> </msub> <mo>+</mo> <msub> <mi>C</mi> <mrow> <mi>t</mi> <mn>12</mn> </mrow> </msub> <mo>)</mo> </mrow> <mn>2</mn> </msup> </mfrac> </mrow>Wherein, using Cq、Ct12Crystal equivalent capacity C in compensation circuit is represented respectivelyq, capacitive pressure sensor capacitance；ΔC For the output characteristics of capacitive pressure sensor.
- 6. according to the method for claim 4, it is characterised in that：When structure be the compensation circuit described in claim 2 when, Equivalent control capacitanceCalculated by following formula：<mrow> <mi>d</mi> <mi>y</mi> <mo>=</mo> <mfrac> <msub> <mi>C</mi> <mi>q</mi> </msub> <mn>2</mn> </mfrac> <mo>&CenterDot;</mo> <mfrac> <mrow> <msub> <mi>nC</mi> <mrow> <mi>t</mi> <mn>21</mn> </mrow> </msub> </mrow> <msup> <mrow> <mo>(</mo> <msub> <mover> <mi>C</mi> <mo>^</mo> </mover> <mrow> <mi>t</mi> <mn>22</mn> </mrow> </msub> <mo>)</mo> </mrow> <mn>2</mn> </msup> </mfrac> <mo>&CenterDot;</mo> <mfrac> <mrow> <mo>-</mo> <mi>n</mi> <mi>&alpha;</mi> <mi>&Delta;</mi> <mi>P</mi> </mrow> <msup> <mrow> <mo>(</mo> <mi>&phi;</mi> <mo>+</mo> <msub> <mi>V</mi> <mi>t</mi> </msub> <mo>)</mo> </mrow> <mn>2</mn> </msup> </mfrac> </mrow>Wherein, using Cq、Ct21Crystal equivalent capacity C in compensation circuit is represented respectivelyq, varactor capacitance Ct21；VtFor The output voltage of resistive pressure sensor, φ=0.7V, n are varactor capacitance variability indexs, and α sensor pressure sensitivity is sensitive Degree, Δ P change value of pressure.
- 7. according to the method for claim 4, it is characterised in that：When structure be the compensation circuit described in claim 3 when, Equivalent control capacitanceCalculated by following formula：<mrow> <mi>d</mi> <mi>y</mi> <mo>=</mo> <mfrac> <msub> <mi>C</mi> <mi>q</mi> </msub> <mn>2</mn> </mfrac> <mo>&CenterDot;</mo> <mfrac> <mrow> <msub> <mi>nC</mi> <mrow> <mi>t</mi> <mn>21</mn> </mrow> </msub> </mrow> <msup> <mrow> <mo>(</mo> <msub> <mover> <mi>C</mi> <mo>^</mo> </mover> <mrow> <mi>t</mi> <mn>22</mn> </mrow> </msub> <mo>)</mo> </mrow> <mn>2</mn> </msup> </mfrac> <mo>&CenterDot;</mo> <mfrac> <mrow> <mo>-</mo> <mi>n</mi> <mi>k</mi> <mi>&alpha;</mi> <mi>&Delta;</mi> <mi>P</mi> </mrow> <msup> <mrow> <mo>(</mo> <mi>&phi;</mi> <mo>+</mo> <msub> <mi>kV</mi> <mi>t</mi> </msub> <mo>)</mo> </mrow> <mn>2</mn> </msup> </mfrac> </mrow>Wherein, using Cq、Ct21Crystal equivalent capacity C in compensation circuit is represented respectivelyq, varactor capacitance Ct21；VtFor The output voltage of resistive pressure sensor, φ=0.7V, n are varactor capacitance variability indexs, and α sensor pressure sensitivity is sensitive Degree, Δ P change value of pressure, the scale factor of k operational amplifiers.
- 8. according to the method for claim 1, it is characterised in that：OCXO products after step (4) processing are re-started often Vacuum test is pressed, to verify OCXO frequency pressure-sensitive character improvements.
- 9. the method according to claim 4 or 8, it is characterised in that：When need improve OCXO products in whole pressure change During the output frequency degree of accuracy when, to varactor Ct21Or capacitive pressure sensor carries out linearization process, obtain new Varactor Ct21Or the capacitance of capacitive pressure sensor, re-execute step (3), (4).
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|---|---|---|---|
| CN201711181963.6A CN107809216B (en) | 2017-11-23 | 2017-11-23 | OCXO pressure-sensitive compensation circuit and OCXO frequency pressure-sensitive characteristic improvement method |
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| CN201711181963.6A CN107809216B (en) | 2017-11-23 | 2017-11-23 | OCXO pressure-sensitive compensation circuit and OCXO frequency pressure-sensitive characteristic improvement method |
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